# Ov er view of Po we rpack Te st ing

done atEP

A James Sanche z 4/15/11Driver Model Ve hicle Model
Dyno Measurement Motor Drive Vehicle Speed Brake Command Torque Speed Command Drive Cycle

Engine Electric Hybrid Tr ansmission Dyno J1939 TC U EC U**T o** **r q** **u e** **S e** **n s** **o r**  Torque Driver & Brake Command Speed

## Mechanical Set Up

Non Hybrid System is set - up similarly

## Te stCell Ins trumen tat ion

 GE 600 Hp DC Dynamometer  Base Speed 2 000 rpm  2100 NM Maximum To rque Absorption  In - Line To rque Meter (HBM)  Te st Cell Controlled Environment:  Te mperature 2 5 deg C, R elative Humidity 65% mperature 2 elative Humidity 65%  Ultrasonic Flow Meter for Engine Intak e Air  Micro Motion Fuel Measurement System (A VL)  Engine Jack et Water Cooling System  Engine Charge Air Conditioning System  Engine Po wer Supply (0 - 30 v or 0 - 50 v)  Emissions Measurement:  Horiba Full Flow CVS and Dilution Tu nnel for Gaseous & Particulate Sampling  A&D i - Te st Software for Te st Cell Automation & Data Logging

# Ve hicle Model P ar amet er s

• Ve hicle Mass (m) • Coe ff icien ts of mechanical dr ag , A m 

# , B m 

# , and C m 

# • Final Driv e Ra tio • Loaded Tir e Radius (r)

# Ve hicle P ar amet ers Used for T es ting Hybrid Conventional Ve hicle Mass (kg) 6450 5883 A (N) 506.12 506.12 B (N/(m/s)) 7.345 7.345 C (N/(m/s)^2) 1.960 1.960 Frontal Area (m^2) 9 9 Ti re Radius (m) 0.381 0.381 Final Drive 4.1 4.1

# Ve hicle Model

2 f m m m 

### F C v B v A    RL f J 

## F F F  

Where: F RL = ro ad load for ce F f = friction and aer odynamic dr ag for ces F J = for ce fr om inertia v = vehicle velocity J 

## dv

F m dt 

# To rq ue and Speed a t Tra nsmission

Output

r F  d ds 

## 2 v k n r   
  Wher e: n ds 

## = r ot at ional speed of drive shaft T ds 

## = tor que at the drive shaft r = r adius of loaded tir e k d 

## = final drive r at io RL ds d 

### r F T k  

# Pe rformance Crit eria

Driv er Model

• ± 2 mph in a 2 sec ond window • Actual a ver ag e pow er has t o be within ± 1.5% of scheduled a ver ag e power


#   2 i m m i m i i 1 N dv v A B v C v m dt P N

                     

## 

# Po ssible Crit eria for

To rq ue Con tr ol

**Parameter To**  **rq ue**  Slope, a 0.830 < a < 1.030 Ta ble 2 of § 1065.514 — Default statistical criteria for validating duty cycles

Slope, a 1 0.830 < a 1 < 1.030 Absolute value of intercept, | a 0 | < 2.0 % of maximum ma pped torque Standard error of estimate, SEE < 10 % of maximum ma pped torque Coefficient of determination, r2 > 0.850

# Br ake Model Br ake is turned of

f when the t or que measur ed at the driv e shaft is less than the t or que defined by the r oad load model

# Driv er Model St ate s

**State Dyno/ Thr** **ot tle Contr** **ol Idle**  **1 To**  **rque/ Po**  **sition Launch**  **2 Speed/ Position**  **Accel/ Coasting 3**  **To rque/**  **Speed Br** **aking 4**  **Speed/ Position**

# Logic for S wit ching Betw een Driv e

Model St ate s
• St ate1 -- > St ate2, if velPwrtSch (+?) > 0 • St ate2 -- > St ate3, if tq Shaft > tq RlmVehDriveshaft (dela yed) • St ate3 -- > St ate4, if posPwrtEngThr ot_CAN < 1.0 and velVeh > ( velPwrtVehSetpoint + 1) (dela yed) • St ate4 -- > St ate3, if tq Shaft < tq RlmVehDriveshaft (dela yed) • St ate2 - 4 -- > St ate1, if velVeh < 0.5 and velPwrtSch (+?) = 0

ate1, if < 0.5 and velPwrtSch Where: velPwrtSch (+?) = the cycle velocity in the future tq Shat = the t or que measured at the transmission output tq RlmVehDriveshaft = Modeled t or que set poin t posPwrtEngThr ot_CAN = thr ottle position velVeh = c alculated vehicle speed fr om dyno speed velPwrtVehSetpoint = the cy cle velocity